sd-dhcp6-client: fix overflow in calculating timeout value

2022-02-14 14:43:45 +09:00
parent d0875a07dd
commit cc5184823f
1 changed files with 4 additions and 4 deletions
@@ -808,6 +808,10 @@ static int client_send_message(sd_dhcp6_client *client, usec_t time_now) {
        return 0;
 }

+static usec_t client_timeout_compute_random(usec_t val) {
+        return usec_sub_unsigned(val, random_u64_range(val / 10));
+}
+
 static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) {
        sd_dhcp6_client *client = userdata;

@@ -861,10 +865,6 @@ static int client_timeout_resend_expire(sd_event_source *s, uint64_t usec, void
        return 0;
 }

-static usec_t client_timeout_compute_random(usec_t val) {
-        return val - (random_u32() % USEC_PER_SEC) * val / 10 / USEC_PER_SEC;
-}
-
 static int client_timeout_resend(sd_event_source *s, uint64_t usec, void *userdata) {
        int r = 0;
        sd_dhcp6_client *client = userdata;